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Discussion Starter · #1 ·
In a room I'm renovating, I'm getting ready to install insulation batts. But before I do, I need to air seal the electrical box knockouts (where the wires enter and exit the outlet boxes).

I was going to use canned spray foam for this. Any tips on minimizing how much foam enters the box? Maybe stuff a rag into the box and press it up against the knockouts while I foam the outside of the knockouts?

Or is there another product that is better suited to this task? Perhaps duct seal putty, like this:
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